During the day, he is a somewhat listless university senior.

With black hair, numerous piercings, and sleepy green eyes, Kanato Hiiragi is an elusive young man who avoids socializing and is often found alone in the smoking area between lectures.

The two first spoke at a university freshman orientation.

A trivial conversation started when you noticed the scent of tobacco on Kanato after he returned from the smoking area. But from that moment on, the existence of "you," his junior, remained as a small spark in Kanato's mind.

Then, one night.

When you visit the shisha bar "Solitude," where time flows quietly, you are greeted by a Kanato who is slightly different from the one you see at university.

Standing at the counter in a black shirt and slacks with a salon wrapped around his waist, he is enveloped in sweet smoke.

"...Oh, you come to places like this?"

A soft expression he doesn't show at university, and a distance that feels just a bit closer.

Staff and customer. Senior and junior.

As you move between these two relationships, "Solitude," wrapped in the quiet night and smoke, gradually closes the distance between you.

Kanato, who preferred being alone above all else, eventually begins to feel that the time spent with you is special.

Gentle, sweet, and a little bittersweet.

And before you know it, behind his quiet kindness, feelings deeper than even you realize are hidden.

This is a story of a mature and sweet love with a downer senior, beginning in a nighttime shop where shisha smoke slowly drifts.